Wavelength conversion film

Abstract

A wavelength conversion film including a phosphor layer and a light scattering layer is provided. The phosphor layer includes a first phosphor and a first substrate. The light scattering layer includes a plurality of titanium dioxide particles and a second substrate. The wavelength conversion film further includes a photoluminescence material and a plurality of nanoparticles. The photoluminescence material and the plurality of nanoparticles are located in at least one of the phosphor layer and the light scattering layer or respectively located in the phosphor layer and the light scattering layer. The wavelength conversion film of the invention may prevent the occurrence of photocatalytic effect and increase the light conversion efficiency.

What is claimed is: 
     
         1 . A wavelength conversion film, comprising:
 a phosphor layer, comprising a first phosphor and a first substrate; and   a light scattering layer, comprising a plurality of titanium dioxide particles and a second substrate,   wherein the wavelength conversion film further comprises a photoluminescence material and a plurality of nanoparticles, and the photoluminescence material and the plurality of nanoparticles are located in at least one of the phosphor layer and the light scattering layer or respectively located in the phosphor layer and the light scattering layer.   
     
     
         2 . The wavelength conversion film according to  claim 1 , wherein the photoluminescence material is located in the phosphor layer, and the plurality of nanoparticles are located in the light scattering layer. 
     
     
         3 . The wavelength conversion film according to  claim 1 , wherein the plurality of nanoparticles are located in the phosphor layer, and the photoluminescence material is located in the light scattering layer. 
     
     
         4 . The wavelength conversion film according to  claim 1 , wherein the photoluminescence material and the plurality of nanoparticles are located in the light scattering layer. 
     
     
         5 . The wavelength conversion film according to  claim 1 , wherein the photoluminescence material and the plurality of nanoparticles are located in the phosphor layer. 
     
     
         6 . The wavelength conversion film according to  claim 1 , wherein the photoluminescence material comprises a second phosphor. 
     
     
         7 . The wavelength conversion film according to  claim 6 , wherein a content of the second phosphor in the photoluminescence material is between 5 wt % and 50 wt %. 
     
     
         8 . The wavelength conversion film according to  claim 6 , wherein the second phosphor comprises BaMgAl:Eu, BaMgAl:Eu,Mn, GdOS:Eu, Y 2 O 3 :Eu, YVO 4 :Nd, or a combination thereof. 
     
     
         9 . The wavelength conversion film according to  claim 1 , wherein an appearance color of the photoluminescence material is white. 
     
     
         10 . The wavelength conversion film according to  claim 1 , wherein a weight ratio of the plurality of nanoparticles to the photoluminescence material is between 0.01 and 0.5. 
     
     
         11 . The wavelength conversion film according to  claim 1 , wherein the plurality of nanoparticles comprise a metal material or a semiconductor material, and the metal material comprises gold, silver, platinum, copper, aluminum, or a combination thereof. 
     
     
         12 . The wavelength conversion film according to  claim 1 , wherein a particle size of the plurality of nanoparticles is between 0.5 nm and 100 nm. 
     
     
         13 . The wavelength conversion film according to  claim 1 , wherein the first phosphor comprises a phosphor emitting yellow light, green light, or red light excited by blue light.